Epidemiologists use various methods to study nutritional health, including:
[Observational studies](#): These include cohort, case-control, and cross-sectional studies that observe dietary habits and health outcomes in different populations. [Randomized controlled trials](#): These are experimental studies where participants are assigned to intervention or control groups to assess the effects of specific dietary components. [Surveillance systems](#): These systems monitor dietary intake and nutritional status at the population level to identify trends and emerging issues.
